diff --git a/app/src/main/kotlin/jackall/overlaymulticounter/Const.kt b/app/src/main/kotlin/jackall/overlaymulticounter/Const.kt
index bc025e5..a66c556 100644
--- a/app/src/main/kotlin/jackall/overlaymulticounter/Const.kt
+++ b/app/src/main/kotlin/jackall/overlaymulticounter/Const.kt
@@ -12,6 +12,7 @@
         const val mainBannerUnitId = "ca-app-pub-6316747512041615/9128099610"
         const val overlayBannerUnitId = "ca-app-pub-6316747512041615/6310364583"
         const val interstitialUnitId = "ca-app-pub-6316747512041615/7926698582"
+        const val interstitialFrequency = 5
         const val develop = false
     }
 }
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